linux-kernel - Re: [GIT PULL] x86/kaslr for v3.14

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Message-ID: <52E7EE54.8030408@nod.at>
Date:	Tue, 28 Jan 2014 18:52:20 +0100
From:	Richard Weinberger <richard@....at>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Ingo Molnar <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Kees Cook <keescook@...omium.org>,
	Cong Ding <dinggnu@...il.com>, Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Mathias Krause <minipli@...glemail.com>,
	Michael Davidson <md@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
Subject: Re: [GIT PULL] x86/kaslr for v3.14

Am 28.01.2014 18:35, schrieb Linus Torvalds:
> On Tue, Jan 28, 2014 at 9:24 AM, Richard Weinberger <richard@....at> wrote:
>>
>> Hmm, my gdb does not like that notion.
>>
>> (gdb) list schedule+0x45
>> Function "schedule+0x45" not defined.
> 
> I don't have a debug build, so maybe it's something specific to gdb
> actually seeing type information and then being confused..
> 
> Can you do "x/10i schedule+0x45" because that definitely works for me.
> But I literally detest DBUG_INFO builds, because it's useless crap.
> 99% of everything I debug is from people reporting problems on their
> kernels, so it's not like my local debug info would match that anyway.

x/10i schedule+0x45 works.

> Anyway, if it's a type information thing due to DEBUG_INFO that
> confuses gdb and makes it think that the "+0x45" part doesn't make
> sense, you may need to add a cast to get gdb to ignore the type
> information. IOW, does
> 
>   list (void *)schedule + 0x45
> 
> work for you?

Nope.

(gdb) list (void *)schedule + 0x45
Function "(void *)schedule + 0x45" not defined.

> I happen to have gdb-7.6.50 here that I tested with, but I've used
> "symbol+offset" forever afaik, so it's definitely not something new.

I'm on 7.5.1.

Thanks,
//richard
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